"Federalism and Fundamental Rights: The Ninth Amendment," 38 Hastings L.J. 305 (1987), reprinted in The Rights Retained by the People: The History and Meaning of the Ninth Amendment (Randy Barnett, ed. 1989)

"Pure Symbols and the First Amendment," 17 Hastings Const. L. Q. 369 (1990), reprinted in The Flag and the Constitution, Vol. II: Flag Burning and the Law (Michael Kent Curtis, ed., 1993).

"Anti-Federalism and the Ninth Amendment," 64 Chi.-Kent L. Rev. 987 (1988), reprinted in The Rights Retained by the People: The History and Meaning of the Ninth Amendment, Vol. 2 (Randy Barnett, ed. 1993).

The Original Meaning of the Religion Clauses, Berkeley Law Federalist Society, October 21, 2010, University of California, Berkeley Law School

Citizens United Today, California Public Utilities Commission, November 2, 2010

Implementing the Second Amendment in the Courts, American Constitution Society, University of California, Davis, Law School, April 6, 2011

Hastings Business Law Journal symposium on Citizens United, April 15, 2011

“Power to the People: The Meaning of the Ninth Amendment,” University of California, Berkeley (Boalt Hall), March 9, 2010

Presenter, “Public Opinion, Cultural Change, and Constitutional Adjudication,” Symposium: Democracy and the Courts, University of California, Hastings, and the Hastings Law Journal, February 19, 2010

Presenter, “Federal Litigation on Same-Sex Marriage,” Symposium: The Future of Same-Sex Marriage, University of San Francisco Law School and the University of San Francisco Law Review, February 26, 2010

Presenter, “Constitutional Limits to Tobacco Marketing Regulations,” at a conference, Implementing the Tobacco Control Act: Advice to the FDA, University of California, Hastings, and the Hastings Science and Technology Law Journal, August 28, 2009

Paper presenter, “Second Amendment Decision Rules,” Symposium on the Second Amendment after Heller, University of California, Hastings, and the Hastings Law Journal, February 13, 2009

Faculty colloquium, New York Law School, October 8, 2008

Faculty colloquium, University of California, Davis Law School, October 4, 2008

Paper presenter, Annual Meeting of the National Conference of State Legislators, Boston, August 2007, “The Commerce Clause and Protectionism: Two Sides to the Coin.”

Canadian Studies Symposium, University of California, Berkeley, November 1993. "The Meaning of the 1993 Federal Election"

Canadian Studies Symposium, University of California, Berkeley, November 1992. "After the Referendum, What Next?"

Participant, Roots of the Common Law colloquium, Clemson University and Liberty Fund, October 1992.

Panelist, Fulbright Roundtable, Canadian Consulate, San Francisco, April 1992, on Canadian constitutional change.

Distinguished Visiting Scholar Lecture, California State University, Sacramento, February 1992 (Delivered a lecture, "Federalism and the Canadian Constitution").

Participant, Liberty and the Ninth Amendment Colloquium, University of Puget Sound Law School, May 1991

Western Social Science Association, Annual Meeting, April 1991. (Presented a paper: "Devolution or Disunion: The Constitution After Meech Lake")

Canadian Institute for Advanced Legal Studies, Stanford University, July 1990. (Presented a paper: "American Fiduciary Duty in an Age of Narcissism")

National Association of Attorneys General, Annual Seminar on State Constitutional Law, May-June 1990. (Presented "The Antifederalist Ninth Amendment and Its Implications for State Constitutional Law").

Symposium on "Controversies of Law," May 1990, co-sponsored by University of California, Hastings. (Presented a paper: "Abortion")

Panel participant, Symposium on Freedom and Federalism, April 1990, George Mason University.

Association of Canadian Studies in the United States, Biennial Meeting, November 1989. (Presented a paper: "Meech Lake and Calhoun's Concurrent Majority.")

Conference on the California Constitution, March 1989, University of California, Hastings.